<?php
/**
 *
 * @copyright Copyright (c) 2018, ownCloud GmbH
 * @license GPL-2.0
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

namespace OCA\PasswordPolicy\Rules;

class Lowercase extends Base {

	/**
	 * @param string $password
	 * @param int $val
	 * @throws PolicyException
	 */
	public function verify($password, $val) {
		if ($this->countLowercase($password) < $val) {
			throw new PolicyException(
				$this->l10n->n(
					'The password contains too few lowercase letters. At least one lowercase letter is required.',
					'The password contains too few lowercase letters. At least %n lowercase letters are required.',
					$val
				)
			);
		}
	}

	private function countLowercase($s) {
		$split = \preg_split('//u', $s, -1, PREG_SPLIT_NO_EMPTY);

		$count = 0;
		foreach ($split as $index => $char) {
			if ($char === \mb_strtolower($char, 'UTF-8') && $char !== \mb_strtoupper($char, 'UTF-8')) {
				$count++;
			}
		}
		return $count;
	}
}
